fetal (US) adjective
or British foetal /ˈfiːtl̟/ or British foetal /ˈfiːtl̟/ Learner's definition of FETAL
: of or relating to a developing animal or human being that is not yet born : of or relating to a fetus胚胎的;胎儿的;关于胎儿的 -
a fetal heartbeat胎儿心跳
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a fetal pig猪胚胎